From an interesting profile on Dr Thomas Noguchi of the Los Angeles County Coroner's Office, who also did autopsies for Robert F Kennedy and Sharon Tate:

When he's asked how Marilyn Monroe looked in death, Noguchi, who has a fondness for poetry, quotes the Latin poet, Petrarch: ‘It's folly to shrink in fear, if this is dying. For death looked lovely in her lovely face.' At the time, though, it's safe to assume that Petrarch was not uppermost on his mind. ‘Of course, I felt pressure, but I remember thinking very clearly that I must make sure I was not distracted by who she was.'